The researchers report that libertarians “score high individualism, low on collectivism, and low on all other traits that involved bonding with, loving, or feeling a sense of common identity with others.”
Similar to Ayn Rand's concept of love in Objectivism.
Love is earned. It is not unconditional.
I don't want to love/bond/respect people that are unworthy of my love/bond/respect. As such, I freely choose my degree of association (or lack of association) with them.
However, the people that I DO love/bond/respect end up earning one of the most devoted friends they can get. And vice-versa.
The above quote is accurate, but I wonder if the predominantly liberal folks who comprise the modern psychiatric community might be tempted to say that libertarians are dysfunctional: Reading an "inability" where there is actually a lack of interest or motivation.